Used commercial market always has a pretty big swing depending on the overall condition of a truck. From what I have seen in the market your mileage is abnormally low for the age of the truck.
It may even be a tough sell because some people will even suspect the mileage was messed with just because its so low, any decent mechanic will see through that however.

I can safely say around 25k would be a fair price for a truck like that private sale possibly more.